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Popular Circuits

Lead Acid Battery Charger with LED indicator

Lead Acid Battery Charger with LED indicator

The above circuit is a precision voltage source, and contains a temperature sensor with a...

Brakelight Stop flasher

Brakelight Stop flasher

This is basically a flasher circuit modified to turn on and off a bulb instead of a LED. It uses...

ESR Meter

ESR Meter

The ESR Meter is basically an AC Ohmmeter with special scales and protective circuitry. It...

A Slug-Controlled Power Switch

A Slug-Controlled Power Switch

This page describes the hardware and software design of a printer power switch controlled over...

Is my zener diode labeled wrong or am i seeing a strange failure mode

Is my zener diode labeled wrong or am i seeing a strange failure mode

A power supply circuit to bring 24VAC down to 5VDC. I have an L7805CV, but rectified (a bridge)...

Digital Stopwatch With 7-segment Schematic

Digital Stopwatch With 7-segment Schematic

Stop watch is made with a digital timer IC LM555 and IC MM74C926 4 digit counter with multiplexed...

Symmetric Noise Source

Symmetric Noise Source

If a transistor junction operating in Zener breakdown is used as a noise source, the amplitude of...

synthesized PLL for Low Power FM transmitter

synthesized PLL for Low Power FM transmitter

This is schematic of a synthesized PLL for the Low Power FM transmitter. By the way, you also can...

Build a Miniature High-Rate Speed Control with Battery Eliminator Circuit (BEC)

Build a Miniature High-Rate Speed Control with Battery Eliminator Circuit (BEC)

This design is based on one published by Milan Lulic in the German magazine elektroModell. Mr....

A non-isolated DC/DC converter circuit diagram

A non-isolated DC/DC converter circuit diagram

For the input and output voltage without isolation but only with a working switch and L, D, C...

Discrete components sound and light control stairs delay switch circuit 8

Discrete components sound and light control stairs delay switch circuit 8

By using a modified piezoelectric ceramics ashamed acoustic-electric transducer sound, light...

Frequency sensitive rheostat for manual and automatic way starting circuit

Frequency sensitive rheostat for manual and automatic way starting circuit

Circuit shown in Figure 3-164. The circuit can be manual and automatic two ways. During startup,...